Copy of Energy Transformations - Assessment

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1. Plugging your cellphone into the wall charges it. This is converting electrical energy from the socket, into chemical energy in the battery, back into electrical, light, and sound energy in your phone. What is this process called?

• A. An energy transcription
• B. The Law of Conservation of Energy
• C. An energy transformation
• D. An energy movement

2. A boy is waiting for the school bus on an extremely cold morning. In order to help his hands feel a little warmer, he rubs them together very quickly. What energy transformation is the boy using to feel warmer?

• A. Mechanical to electrical
• B. Electrical to mechanical
• C. Thermal to mechanical
• D. Mechanical to thermal

3. A radiometer is a device that has thin blades inside a glass bulb. One side of each blade is black and the other side is white. The blades spin as light from the Sun is absorbed by the black side and reflected by the white side. What energy transformation is occurring?

• A. Sound to mechanical
• B. Electromagnetic to mechanical
• C. Thermal to electromagnetic
• D. Mechanical to thermal

4. During most energy transformations some energy is transformed and released as which of the following forms of energy?

• A. Thermal
• B. Chemical
• C. Electromagnetic
• D. Nuclear

5. An electric stove is used to heat up a pot of water. What energy transformation takes place in order to cause the water to boil?

• A. Electrical to thermal
• B. Electrical to chemical
• C. Thermal to electrical
• D. Chemical to electrical

6. Which of the following energy transformations occurs within the generator of a wind turbine?

• A. Mechanical to chemical
• B. Mechanical to electrical
• C. Chemical to electrical
• D. Electrical to thermal

7. All forms of energy and energy transformations can be traced back to the ____________________.